If you think it's the diamonds getting "worn" I'd like to understand how and why with evidence. Diamonds are the hardest material known to man and I really don't think rubbing them on a stone is wearing them one bit. Now the steel plate holding the diamonds might be wearing out, and losing its hold on the diamonds, but the diamonds themselves are not being "worn".

Why buy all the stuff you don't need? Multiple types of loose SiC powders, a cookie sheet, a flat piece of tile etc? All you need is one dmt 325. Mine was purchased not long after I joined this site, so it's 3 years old and has never once been a problem. I think I paid $46 on amazon.save ypurself the time, money, mess etc and get a atoma or dmt diamond plate. You will never look back.